Jeep Cherokee 2000 Service Manual - page 1217
(1) Start the engine and bring to operating tem-
perature. Be sure all accessories are off before per-
forming this test.
(2) Shut off engine and remove air duct at throttle
body.
(3)
2.5L 4–Cylinder Engine: Near front/top of
valve cover, disconnect CCV tube at fixed orifice fit-
ting (Fig. 21). Insert Special Tool 6714 into end of
disconnected CCV tube (insert either end of tool into
tube). Let tool and tube hang disconnected at side of
engine.
(4)
4.0L 6–Cylinder Engine: Disconnect CCV
tube (Fig. 22) at intake manifold fitting. Attach a
short piece of rubber hose to special tool 6714 (insert
rubber hose to either end of tool). Install rubber hose/
tool to intake manifold fitting. Let CCV tube hang
disconnected at side of engine.
(5) Connect DRB scan tool to 16–way data link
connector. This connector is located at lower edge of
instrument panel near steering column. Refer to
appropriate Powertrain Diagnostic Procedures ser-
vice manual for DRB operation.
(6) Start engine and allow to warm up.
(7) Using the DRB scan tool, scroll through menus
as follows: select—Stand Alone DRB III, select the
year 2000 Diagnostics, select—Engine, select—Sys-
tem Test, select—Minimum Air Flow.
(8) The DRB scan tool will count down to stabilize
idle rpm and display minimum air flow idle rpm. The
idle rpm should be between 500 and 900 rpm. If idle
speed is outside these specifications, replace throttle
body. Refer to Throttle Body Removal/Installation.
(9) Disconnect DRB scan tool from vehicle.
(10) Remove orifice tool and connect CCV tube to
engine.
(11) Install air duct to throttle body.
REMOVAL AND INSTALLATION
AUTOMATIC SHUTDOWN (ASD) RELAY
The ASD relay is located in the Power Distribution
Center (PDC) (Fig. 23). Refer to label on PDC cover
for relay location.
REMOVAL
(1) Remove PDC cover.
(2) Remove relay from PDC.
(3) Check condition of relay terminals and PDC
connector terminals for damage or corrosion. Repair
if necessary before installing relay.
(4) Check for pin height (pin height should be the
same for all terminals within the PDC connector).
Repair if necessary before installing relay.
INSTALLATION
(1) Install relay to PDC.
(2) Install cover to PDC.
Fig. 21 Install Orifice Tool 2.5L 4–Cylinder Engine
1 – AIR INLET FITTING
2 – AIR FILTER COVER
3 – FIXED ORIFICE FITTING
Fig. 22 Install Orifice Tool 4.0L 6–Cylinder Engine
1 – AIR INLET FITTING
2 – FIXED ORIFICE FITTING
3 – AIR FILTER COVER
XJ
FUEL SYSTEM
14 - 43
DIAGNOSIS AND TESTING (Continued)